15 November 2002 Charge carrier transport in nanoporous ZnO electrodes
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By applying a simple phenomenological model in the analysis of transient photocurrents arising in particulate ZnO films, several information are gained concerning the transport of electrons through the nanoporous network. From the results of experiments using electrodes with different thicknesses of the ZnO film, the driving force of the transport is identified as a gradient in the electrochemical potential across the electrode. Furthermore, since no effect of the ambient temperature on the transport dynamics at positive potentials is observed, an tunneling mechanism is proposed for the basic electron exchange between adjacent particles. By changing the average size of the ZnO particles, information about the height and the width of the potential barrier are drawn for the different ensembles of nanoparticles.
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Alexander Eychmuller, Alexander Eychmuller, Volker Noack, Volker Noack, "Charge carrier transport in nanoporous ZnO electrodes", Proc. SPIE 4807, Physical Chemistry of Interfaces and Nanomaterials, (15 November 2002); doi: 10.1117/12.451034; https://doi.org/10.1117/12.451034

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